Coordination geometry of tetradentate Schiff’s base nickel complexes: the effects of donors, backbone length and hydrogenation
作者:Michelle K. Taylor、John Reglinski、Dawn Wallace
DOI:10.1016/j.poly.2004.10.002
日期:2004.12
The X-ray crystal structures of (N,N'-bis-(o-amidobenzilidene)-1,3-diaminopropane)nickel (Niambpr), (N,N'-bis-(o-amidobenzilidene)-1,4-diaminobutane)nickel (Niambut), (N,N'-bis-(o-thiobenzilidene)-1,4-diamino butane) nickel(II) (Nitsalbut), bis-acetonitrile-(N,N'-bis-(o-aminobenzyl)-1,2-diaminoethane)}nickel(II) tetrafluoroborate [Ni(H(4)amben)(MeCN)(2)] [BF4](2), bis-O-acetato(N,N'-bis-(o-aminobenzyl)-1,2-diaminoethane)}nickel(II) [Ni(H(4)amben)(OAc)(2)(H2O)-H-.] and bis-O-acetato-(N,N'-bis-(o-aminobenzyl)-1,3-diaminopropane)}nickel(II) [Ni(H(4)ambpr)(OAc)(2)] are presented. These structures complete the structural characterisation of the simple unsubstituted Schiffs base complexes with N-4 and N2S2 donor sets and allow us to assess the effects of donor groups and polymethylene chain length on the coordination geometries of nickel(II). The hydrogenated N-4 complexes offer an insight into the effects of increased flexibility and character of the internal nitrogen donors. Unlike the parent N-4 imine species the hydrogenated amine species do not deprotonate at the peripheral nitrogen donors and do not seem to be restricted to the meridial plane of the nickel. (C) 2004 Elsevier Ltd. All rights reserved.